common: Make it compile

* Provide our own hal_attribute macro but without neverallows
* Workaround silly issue when compiling system_ext public sepolicy
  without any rules

Change-Id: Id7eb04bd049b13380e69a0367fb588f226a93980
diff --git a/sepolicy/public/te_macros b/sepolicy/public/te_macros
new file mode 100644
index 0000000..72be01b
--- /dev/null
+++ b/sepolicy/public/te_macros
@@ -0,0 +1,10 @@
+#####################################
+# hal_attribute_omni(hal_name)
+define(`hal_attribute_omni', `
+attribute hal_$1;
+expandattribute hal_$1 true;
+attribute hal_$1_client;
+expandattribute hal_$1_client true;
+attribute hal_$1_server;
+expandattribute hal_$1_server false;
+')